The sign said “Disneyland left” which is the same as “Disneyland went away”.
And if Disneyland went away there is no way to go to Disneyland so they returned home.

Slide the newspaper under the a door and let both brothers stand on opposite sides of the door.

A perfect example of ruining a riddle by adding a picture with the answer.

There are 4 solutions:  641, 752, 863 and 974

56, 58, 60, 64 and 65 pounds

In most periods of 4 years there are 1461 days.
But some periods have 1460 days. (When it contains a year divisible by 100 but not by 400)

Her brother, because in England all shops and restaurants are closed on Christmas Day.

59 + 59/59
61 – 61/61

Cerena – Benedicta – Aliza

The middle sister can’t be Aliza because she would say “I am Aliza”
The left sister can’t be Aliza because the wouldn’t say that the middle sister was Aliza.
So Aliza is the right sister.
That also means that the middle sister is Benedicta because Aliza said so.
And that leaves the left sister which can only be Cerena

The circumference of a circle with radius R is 2*pi*R

We have two radius’s R1 and R2 with circumferences 2*pi*R1 and 2*pi*R2 and the difference is 2*pi*(R2-R1) = 10 m. So the elevation (R2-R1) = 10/(2*pi) = 1,59 m